乙酸酐 、 vibsanin H 在
吡啶 作用下,
反应 10.0h,
生成 vibsanin H 15,18-diacetate
参考文献:
名称:
Vibsane Diterpenoids from the Leaves and Flowers of Viburnum odoratissimum
摘要:
In addition to the five known compounds 5-epi-vibsanin H, vibsanins C, H, and G, and aldovibsanin B, four new diterpenes, 5-epi-vibsanin G (1), 18-O-methylvibsanin G (2), vibsanin M (3), and aldovibsanin C (4), were isolated from an acetone extract of the leaves and flowers of Viburnum odoratissimum by bioassay-directed fractionation. In addition, two acetyl derivatives 5 and 6 were obtained from the naturally occurring diterpenes. The structures of the new compounds were established on the basis of NMR spectral analysis, including COSY, HMQC, HMBC, and NOESY correlations. The compounds were evaluated for cytotoxicity against human nasopharyngeal carcinoma (HONE-1) tumor cells and human gastric cancer (NUGC-3) cells.
Structures of New Seven-Membered Ring Vibsane-Type Diterpenes Isolated from Leaves of Viburnum awabuki.
摘要:
从荚蒾(荚蒾科)的叶中分离出五种新的荚蒾烷型二萜类化合物,分别是荚蒾素 G、荚蒾素 H、荚蒾素 K、18-O-甲基荚蒾素 K 和 15, 18-二-O-甲基荚蒾素 H。通过光谱数据分析阐明了它们的结构,包括将它们的 13C-NMR 数据与先前已知的荚蒾素 C 进行比较,并通过 X 射线晶体学分析和化学转化分别证实了荚蒾素 H 和 K 的结构。这五种新化合物与七元环荚蒾烷型二萜类化合物荚蒾素 C 仅在 C-12-C-17 侧链上有所不同。